Cápsula, pen. cor. Diminut. Plin. A little coffer or chest.
Lewis and Short: Latin dictionary
capsŭla, ae, f.dim. [capsa], a small box or chest, Fab. Pictor. ap. Gell. 10, 15, 14; Cat. 68, 36; Plin. 30, 11, 30, 102.—Hence, homo de capsulā, one who is excessively neat, nice: juvenes barbā et comā nitidi, de capsulā toti,